These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Tear Jerker: The death of Maester Luwin, even more now that the Stark family was able to tend to his mortal wound.
Robb Stark dying from his wounds inflicted by Ramsay, even after winning the trial by combat. The fact that he comes back to life at the end of the chapter doesn't help the fact that he dies in the books.
The fact that people that survived in the books die here, such as Ser Dontos (in the book saved by Sansa's suggestion that he could become the court fool) or Brienne (who was saved by Catelyn's intervention and witnessing of the shadow that kills Renly).